Buggy code:
public class StringConverterTest extends TestCase { private final Dictionary dictionary = new SimpleDictionary ( "my<seq2seq4repair_space>dict" ) ; private final SynonymCatalog synonymCatalog = new SimpleSynonymCatalog ( "my<seq2seq4repair_space>synonyms" ) ; private final ReferenceDataCatalogImpl referenceDataCatalog = new ReferenceDataCatalogImpl ( Arrays . asList ( dictionary ) , Arrays . asList ( synonymCatalog ) , new ArrayList < org . datacleaner . reference . StringPattern > ( ) ) ; private StringConverter stringConverter ; @ Override protected void setUp ( ) throws Exception { } public void testConvertConvertableType ( ) throws Exception { } public void testConvertSimpleTypes ( ) throws Exception { } public static class MySerializable implements Serializable { private static final long serialVersionUID = 1L ; private final String myString ; private final int myInt ; public MySerializable ( String myString , int myInt ) { } public int getMyInt ( ) { } public String getMyString ( ) { } } public void testConvertList ( ) throws Exception { } public void testConvertExpressionDates ( ) throws Exception { } public void testConvertSerializable ( ) throws Exception { String serialized = stringConverter . serialize ( new StringConverterTest . MySerializable ( "foobar" , 1337 ) ) ; <START_BUG> assertEquals ( "&#91;-84&#44;-19&#44;0&#44;5&#44;115&#44;114&#44;0&#44;69&#44;111&#44;114&#44;103&#44;46&#44;101&#44;111&#44;98&#44;106&#44;101&#44;99&#44;116&#44;115&#44;46&#44;97&#44;110&#44;97&#44;108&#44;121&#44;122&#44;101&#44;114&#44;46&#44;117&#44;116&#44;105&#44;108&#44;46&#44;99&#44;111&#44;110&#44;118&#44;101&#44;114&#44;116&#44;46&#44;83&#44;116&#44;114&#44;105&#44;110&#44;103&#44;67&#44;111&#44;110&#44;118&#44;101&#44;114&#44;116&#44;101&#44;114&#44;84&#44;101&#44;115&#44;116&#44;36&#44;77&#44;121&#44;83&#44;101&#44;114&#44;105&#44;97&#44;108&#44;105&#44;122&#44;97&#44;98&#44;108&#44;101&#44;0&#44;0&#44;0&#44;0&#44;0&#44;0&#44;0&#44;1&#44;2&#44;0&#44;2&#44;73&#44;0&#44;5&#44;109&#44;121&#44;73&#44;110&#44;116&#44;76&#44;0&#44;8&#44;109&#44;121&#44;83&#44;116&#44;114&#44;105&#44;110&#44;103&#44;116&#44;0&#44;18&#44;76&#44;106&#44;97&#44;118&#44;97&#44;47&#44;108&#44;97&#44;110&#44;103&#44;47&#44;83&#44;116&#44;114&#44;105&#44;110&#44;103&#44;59&#44;120&#44;112&#44;0&#44;0&#44;5&#44;57&#44;116&#44;0&#44;6&#44;102&#44;111&#44;111&#44;98&#44;97&#44;114&#93;" , serialized ) ; <END_BUG> StringConverterTest . MySerializable deserialized = stringConverter . deserialize ( serialized , StringConverterTest . MySerializable . class ) ; assertEquals ( "foobar" , deserialized . getMyString ( ) ) ; assertEquals ( 1337 , deserialized . getMyInt ( ) ) ; } public void testAbstractNumber ( ) throws Exception { } public void testEnum ( ) throws Exception { } public void testEnumWithAlias ( ) throws Exception { } public void testFile ( ) throws Exception { } public void testReferenceDataSerialization ( ) throws Exception { } public void testSerializeUnknownTypes ( ) throws Exception { } public void testSerializeSchemaElements ( ) throws Exception { } public void testNullArgument ( ) throws Exception { } public void testArrays ( ) throws Exception { } public void testDoubleSidedArray ( ) throws Exception { } public void testDeepArray ( ) throws Exception { } private void runTests ( final Object o , String expectedStringRepresentation ) { } public void testSerializeList ( ) throws Exception { } }

Fix:
assertEquals ( "&#91;-84&#44;-19&#44;0&#44;5&#44;115&#44;114&#44;0&#44;63&#44;111&#44;114&#44;103&#44;46&#44;100&#44;97&#44;116&#44;97&#44;99&#44;108&#44;101&#44;97&#44;110&#44;101&#44;114&#44;46&#44;117&#44;116&#44;105&#44;108&#44;46&#44;99&#44;111&#44;110&#44;118&#44;101&#44;114&#44;116&#44;46&#44;83&#44;116&#44;114&#44;105&#44;110&#44;103&#44;67&#44;111&#44;110&#44;118&#44;101&#44;114&#44;116&#44;101&#44;114&#44;84&#44;101&#44;115&#44;116&#44;36&#44;77&#44;121&#44;83&#44;101&#44;114&#44;105&#44;97&#44;108&#44;105&#44;122&#44;97&#44;98&#44;108&#44;101&#44;0&#44;0&#44;0&#44;0&#44;0&#44;0&#44;0&#44;1&#44;2&#44;0&#44;2&#44;73&#44;0&#44;5&#44;109&#44;121&#44;73&#44;110&#44;116&#44;76&#44;0&#44;8&#44;109&#44;121&#44;83&#44;116&#44;114&#44;105&#44;110&#44;103&#44;116&#44;0&#44;18&#44;76&#44;106&#44;97&#44;118&#44;97&#44;47&#44;108&#44;97&#44;110&#44;103&#44;47&#44;83&#44;116&#44;114&#44;105&#44;110&#44;103&#44;59&#44;120&#44;112&#44;0&#44;0&#44;5&#44;57&#44;116&#44;0&#44;6&#44;102&#44;111&#44;111&#44;98&#44;97&#44;114&#93;" , serialized ) ;